[Qgis-user] scale dependent point clustering (for visualization only)

[Pirmin Kalberer]

Am Mittwoch, 1. Juni 2011, um 16.22:46 schrieb Brad Nesom:
> something similar to this?
> http://help.arcgis.com/en/webapi/flex/samples/index.html?sample=FeatureLaye
> rClustering I don't mean for the post to irritate. It is such an elegant
> solution (although a web solution)  I just had to show it.
> Maybe someone can work some magic in qgis.

Just for completeness, the same thing as Open Source:
http://openlayers.org/dev/examples (Search for cluster)
http://mapserver.org/mapfile/cluster.html

> 
> On Fri, May 27, 2011 at 6:09 AM, Andreas Neumann <a.neumann at carto.net>wrote:
> > No, the point displacement render is almost the opposite to clustering.
> > It explodes feature that are stacked on top of each other so one can see
> > that there are several features at the same place with potentially
> > different symbolization.
> > 
> > A cluster renderer would be a valuable addition to QGIS as a separate
> > renderer. If your data resides in Postgis, you can also use Postgis and a
> > view if you need clustering. I once did this for a report information
> > system. You can round the coordinates and group/aggregate them and then
> > average by its original coordinates so that the cluster position is at
> > the weighted coordinate of all input point geometries. It is not very
> > hard to do in Postgis.
> > 
> > Andreas
> > 
> > On Fri, 27 May 2011 11:50:07 +0200, Anita Graser wrote:
> >> Isn't that what Point Displacement Renderer does?
> >> 
> >> Best wishes,
> >> 
> >> Anita
> >> 
> >> On Fri, May 27, 2011 at 10:59 AM, Giovanni Manghi  wrote:
> >>  seems a nive idea for a plugin.
> >>  
> >>> Cheers
> >>> 
> >>> -- Giovanni --
> >>> 
> >>> On Fri, 2011-05-27 at 16:57 +0800, maning sambale wrote:
> >>> > I'm looking for ways to create simple visualization of point
> >>> 
> >>> clusters
> >>> 
> >>> > (in QGIS of course) similar to the openlayers cluster strategy:
> >>> > http://openlayers.org/dev/examples/strategy-cluster.html [1]
> >>> > 
> >>> > The purpose is simply for visualization and can be configured by
> >>> 
> >>> map scale.
> >>> 
> >>> 
> >>> _______________________________________________
> >>> Qgis-user mailing list
> >>> Qgis-user at lists.osgeo.org [2]
> >>> http://lists.osgeo.org/mailman/listinfo/qgis-user [3]
> >> 
> >> Links:
> >> ------
> >> [1] http://openlayers.org/dev/examples/strategy-cluster.html
> >> [2] mailto:Qgis-user at lists.osgeo.org
> >> [3] http://lists.osgeo.org/mailman/listinfo/qgis-user
> >> [4] mailto:giovanni.manghi at gmail.com
> > 
> > --
> > --
> > Andreas Neumann
> > Böschacherstrasse 10A
> > 8624 Grüt (Gossau ZH)
> > Switzerland
> > 
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user


-- 
Pirmin Kalberer
Sourcepole  -  Linux & Open Source Solutions
http://www.sourcepole.com